Automatic gas cut-off.



A. W. MARCILLE.

AUTOMATIC GAS CUT-OFF.

APPLICATION FILED ocr. 9, 1914.

Pzmntedsept. 28, 1915. I

ALBERTW. MARCIi-LE, F THOROLD, ONTARIO, CANAiIDA.

' aUtronA'rIc Gas cU'r-orr.

Specification of Letters Patent.

Patented Sept. 28, 1915.

Application filed October 9, 1914. Serial No. 885,931.

siding at Thorold, in the Province of Ontario, Dominion of Canada, have invented new and useful Improvements in Automatic Gas Cut ilii's, of whichthe following is a specification.

The invention relates to an improvement in automatic gas cut oiis, designed particularly to insure against passage of the gas beyond the control valve of the burner after llgflt has been for any reason extinguished.

The main object ofthe present invention is the provision'of an automatic gas extinguisher involving a locking means for bolding the valve in open position, and means controlled thermostatically for operating the The invention in the referred form of details will be described in thefollowing specification, reference being had particularly to the accompanying drawings, in which Figure 1 is a perspective view illustrating the improvement. Fig. 2 is a section on line In constructing the improved device, the gas service pipe 1 adjacent the burner 2 is provided with a cut-ofi" orvalve3,'operated through the medium of the usual handle an. the valve, stem 5 being projected through and beyond the pipe 1 and provided with a ratchet 6, being also engaged by a coil spring 7 terminally secured and so tensioned as to normally close the valve when free to act. Supported on the'pipe 1, is a dog 8 spring pressed through the medium of the spring 9 to maintain a locking engagement with the ratchet 6, whereby to lock the ratchet in position to maintain the valve open to a degree set by the handle 4. The

dog has a vertical projection 10 terminatingin an eye 11.

Secured upon the pipe 1 is a reservoir 12, preferably in the form of a pipe like member, closed at one longitudinally o and in parallelism with the pipe 1. A plunge ror piston 14: is slid-v lend as-at l3 and supported ably mounted in the reservoir, maintaining close contact therewith and providin between the end 15of such piston an closed end of the reservoir, a chamber to contain a heat expanding fluid, as mercury or the like- A rod 18 is secured to and projecting beyond the end of thepiston 1t and through the eye 11, being formed with one or more teeth 16 adapted in movement of the rod lD'OIlB direction to engage the Wall of the eye, as will be evident. A, spring 20 encircles the rod 18, hearing between a stop 21 thereon and the fixed stop 22 secured to the pipe 1.

In operation, the valve 3 is opened and locked in open position by the dog 8, the teeth 16 being manually released from the wall of the eye. As the expansive fluid becomes heated, it advances the piston and rod 18 so that the tooth rides over and is arrangeil beyond the wall of the eye toward the valve 3. If the light becomes extinguished for any'reason, the cooling of the expansive fluid permits the spring 20'to return the plunger or piston and rod with the eiiect to cause the tooth 16 to engage the wall of the eye andwithdraw the dogs 8 from cooperation with the ratchet 6, thereby permittirfg the spring 7 to close the valve.

What is claimed is A gas extinguisher including a controlling valve, a (log for locking the valve in openposition, an expansible liquid holding chamber arranged in proximity to the gas burner, a piston in said chamber, a rod pro jecting from the piston, a projection extending from the dog and terminally formed with an eye to permit the passage of the rod therethrough, said rod below theeye being formed with a tooth, the eye being elongated to permit lateral play of the rod to disengage the tooth andprojection in the initial setting of the device.

In testimony whereof- I aiiix my signature in presence of two'witnesses.

ALBERT-W. MARGILLE. Witnesses:

G. J. HOOCHBANK, T. F. BATTLE.

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